Centrifugal pump



Original Filed Aug. 27, 1940 lmwzl'm'z' 5. 50 fizz 47555,

Way/7km Patented Apr. 29, 1947 CEN'IRIFU GAL PUMP Fred Miess, GaryJnd.

Original application August 27, 1940, Serial No. 354,432. Divided and this application June 6, 1944, Serial No. 538,906

'2 Claims. (01. 103-103) This invention relates to centrifugal pumps and more particularly to one which may be used for handling and distributing mercury in an electrical ignition apparatus, although not limited thereto.

Centrifugal pumps of conventional design comprise a stationary casing, a rotary impeller within the casing, a shaft for supporting and motivating the impeller, packing glands around the tion to provide a centrifugal pump which over-' comes the shortcomings of prior art devices in that it eliminates the necessity of packing glands, is self-priming, and requires no T valve.

Another object is the provision of a. centrifugal pump which is-of extremely simple and inexpensive design, consisting fundamentally of a rotating element which serves as both the casing and the rotary impeller.

The foregoing and other objects will become apparent after referring to the drawings.

In said drawings:

Figure 1 is a plan of the top of the pump of the present invention;

Figure 2 is a vertical elevation showing part of the pump in section; and

Figure 3 is a sectional view on the line III-III of Figure 2.

Referring more particularly to the drawings, the numerals I and 2 designate a, pair of spaced bearings, the shaft-receiving apertures of which are in vertical alignment and are adapted to receive a shaft 8 which depends therefrom and has integrallyformed at the lower end thereof a right angular flange 4 from which" there depends a tubular housing 5 which takes the shape of an inverted frusto-cone. Immediately below the flange l, the upper, and therefore largest, portion of the casing 5 is provided with a pair of radially opposite tubular extensions 6, the side faces of which are provided with reversely disposed apertures 1, whereby the said apertures may face a given direction of rotation of the casing 5. Between the bearings I and 2 the shaft 3 has secured thereto a pulley 8 to which there is connected a belt 9, the latter deriving energy from any suitable source (not shown). Disposed immediately beneath the lower portion of thecasing 5 is a sump I2 which is adapted to receive the.

liquid to be pumped. Beneath, and closely adjacent, the upper portion of the casing 5, and accordingly the flange I which is integrally formed on the bottom of the shaft 3, is a stationary annular trough M. This annular trough ll provides an outer wall which extends upwardly beyond the horizontal plane of the upper surface of the annular flange 4 and a concentric inner wall which is closely adjacent the outer surface of the upper portion of the casing 5 and terminates immediately below the tubular-extensions 6. The lower portion of the outer wall of the annular trough I4 is provided with an aperture H with which there is connected a spout It. This spout I8 is connected (not shown) with the instrumentality to which the liquid is, to be pumped; and a return pipe (like not shown). is connected to the sump l2, thus providing a circuit.

According to the manner of operation of the I device of the present invention, it will be found that when the sump I2 is continuously provided with sufficient liquid to rise upwardly into the lower portion of the-casing 5, rotation of-the latter at suflicient speed will cause the liquid to acquire the motion of the rotating casing and tend to cause it to rise along the side walls thereof. Centrifugal force will cause it to flow outwardly through the apertures I in the tubular extensions 6 in the direction of the arrows of Figures 1 and 2. The liquid is made to flow in the manner described as long as liquid continues to enter the bottom of the casing 5 from the sump l2. One essential is that the liquid must enter the casing 5 nearer its axis of rotation than the point at which it leaves the upper portion of the said casing. The shape of the said casing is to a large extent immaterial so far as its ability to function is concerned. However, the inverted frusto-cone is preferable from the standpoint of efllciency, and principally to enable the entering liquid to more readily attain the rotary motion of the casing. In addition, the inner surface of the casing is preferably provided with opposed helical vanes 20 which enhance the attainment of the rotary motion of the liquid.

This application is a division of my copendins application, Serial No. 355,432, m d August 27,

. 3 I claim: 7 1. a centrifugal from a sump containing the liquid being pumped.

which pump comprises a substantiall vertically disposed rotatable tubular casing having an inverted frusto-conical shape, having its upper end extended into an enlarged head having oppositely directed tubular extensions and having an open lower end forming a liquid intake openin8. the said tubular extensions communicating with op-, positely disposed fluid passage ports, the said ports being located in end portions of the tubular extensions andbeing disposed in a horizontal plane, the said ports projecting in a direction tangential to the rotation of the casing, helical lifting vanes'in the casing starting at the open pump adapted to 1m liquid tangential to the rotation of the casing, helical lifting vanes in the casing starting at the open lower end of the casing and terminating at the upper end of the frutso-conical casing, the helical vanes having a pitch substantially longer 7 than the height of the frusto-conical casing for producing a gradual and uniformly accelerated lifting of the liquid from a point of zero speed of rotation to a point of maximum speed of rotation in the frusto-conical casing, at which maximum speed of rotation centrifugal force acts upon the liquid pressing it against the outwardly inclined inner surface of the casing with sumlower end of the casing and terminating at the enlarged head at the upper end of the frustoconical casing, the helical vanes having a pitch substantially longer than the height of the irustoconical casing for producing a gradual and uniformly accelerated lifting of the fluid from a point of zero speed of rotation to a point of maximum speed of rotation in the frusto-conical casing,- at which maximum speed of rotation with cient pressure to cause the liquid to flow upward in the casing and out through the tubular extensions and tangentially disposed ports discharging the liquid in a direction opposite to the direction of rotation of the casing and at a velocity approximately equal to the velocity of romaximum centrifugal force the fluid is projected horizontally from the frusto-conical casinginto the enlarged head from which it is projected hori- 'zontally through the said passage ports in the end portions of the head, at still further increased centrifugal force, a chamber for receiving the i fluid passed through the ports. the fluid receiving chamber being positioned exteriorly of the enlarged head, means for rotating the casing with its head, and a fluid discharge opening in the said chamber.

2. A centrifugal pump adapted to lift liquid from a sump containing the liquid to be pumped, which pump comprises a substantially vertically rotatable tubular casing of an inverted i'rusto-conical shape having oppositely directed tation of the' ports thus utilizing the reaction of the liquid issuing from the ports to assist in driving the pump and also reducing the actual velocity of the discharged liquid to nearly a zero value, a chamber for receiving the liquid passed through'the ports, the liquid receiving chamber being positioned exteriorly of the upper end of the casing, means for rotating the casing, and a liquid discharge opening in the said chamber.

Y 4 FRED MIESS.

I REFERENCES CITED The following references are of record in the 'flle of this patent:

tubular extensions and having an open lower end forming a liquid intake opening, the said tubular extensions communicating: with oppositely disposed liquid passage ports, the said ports being located in the end portions of the tubular extensions and beingdisposed in a horizontal plane, the said ports projecting in adirection British 1909 

